Borate crystal Zn4B6O13 (ZBO) exhibits excellent optical properties and exceptional thermal stability. In this study, large-sized ZBO and Ni-doped ZBO (Ni:ZBO) single crystals were grown using the Kyropoulos method, and their structural, thermal, electro-elastic, and optical properties were comprehensively investigated. Ni2+ doping substituted Zn2+ without altering the cubic crystal structure, slightly increasing the thermal expansion coefficient to 5.72 ± 0.08 × 10− 6 K−1 in the temperature range of 25–670 °C while maintaining a remarkably low value compared to most laser crystals. Ni:ZBO displayed enhanced piezoelectric performance (d14 = 1.49 pC N−1 at room temperature), ∼21% higher than ZBO, and retained a high degree of temperature stability. Optical analysis showed high transmittance from 241 nm to the mid-infrared range and characteristic absorption peaks. Additionally, strong short-wavelength emission at 440 nm was observed in the Ni:ZBO crystal, indicating its potential as a high-quality gain medium for blue-violet laser generation. These findings underscore the promise of Ni:ZBO as a material suitable for high-temperature piezoelectric and laser crystal applications.
Wei Wang,Hang Yang,Meiqian Fu,Xinyang Zhang,Mengyu Guan,Yi Wei,Chun Che Lin,Guogang Li
Thermal quenching is still a pivotal challenge for phosphor materials in white light emitting diodes lighting applications. Herein, we propose an effective strategy to design a near zero-thermal-quenching green emission in zero-thermal-expanding Zn 4 B 6 O 13 host based on unique 3D isotropic cage structure. The integrated emission intensity of Zn 4 B 6 O 13 :Mn 2+ could maintain 103% of initial intensity at 150 °C and 98% at 250 °C under blue light excitation. During the low-frequency vibrations, the unchanged bonds and angles induce the zero thermal expansion, and the unaffected lattice and coordination environment contribute the nearly unchanged emission intensity during the heating process. In addition, an efficient self-reduction of activators in the studied system is ascribed to vacancy and interstitial oxygen defects act as donors to provide electrons. This work initiates a novel strategy to construct thermally-stable and self-reductive phosphors for multiple optical applications.
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